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  #1  
Old 11-20-2014, 05:10 PM
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DEF contamination

We are all worried about the expiration of DEF but has anyone read up on the ease of contamination?

I was reading and I may be misunderstanding something but it seems as though DEF is 32.5% urea and 67.5% pure dionized water and a type of salt chrystals form when ionized particles are introduced in DEF...and it doesn't take much. Any ionized material, which is pretty much everything, will contaminate DEF. Normal water, even water vapor from the air, is ionized and a small amount can wreak havok.

So, is it wise to make sure and wipe off all filler spouts and not leave the DEF tank uncapped for any longer than necessary? Several of us have had our DEF doser (injector) clogged with chrystals...I.wonder if contamination occured?

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  #2  
Old 11-20-2014, 07:59 PM
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Re: DEF contamination

I have a 2010 GMC Denali HD with the Duramax engine. It requires DEF. I purchased a 55 gallon drum when I got the truck. The drum sat in my shop garage. temps ran from 35 degrees to 80 degrees. It lasted me till Oct 2014. I never once had an issues or problems. I just purchased another drum. Since I now have 2 diesels that require DEF, Im sure it won't last that long this time.
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Old 11-20-2014, 08:58 PM
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Re: DEF contamination

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Originally Posted by croft1972 View Post
I have a 2010 GMC Denali HD with the Duramax engine. It requires DEF. I purchased a 55 gallon drum when I got the truck. The drum sat in my shop garage. temps ran from 35 degrees to 80 degrees. It lasted me till Oct 2014. I never once had an issues or problems. I just purchased another drum. Since I now have 2 diesels that require DEF, Im sure it won't last that long this time.
As long as it stayed clean in your barrel, the only issue would be shelf life due to temperature. My worry is that my problems began with a DEF fillup at a Love's Truckstop. The dispenser wasn't very clean. The nozzle sits next to the grime covered diesel handle on the pump. My injector was clogged with Chrystals and my DEF pump failed. Where did these Chrystals cone from? Contamination...according to what I am reading. If it wasn't so hot here in the South, I'd buy in bulk but I don't have a cool place to store it.
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Old 11-20-2014, 09:09 PM
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Re: DEF contamination

I paid $135 for the 55 gallon drum from the local oil distributor. I've seen it for $189 at NAPA. What do they charge at the pump for def?


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Old 11-20-2014, 09:26 PM
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Re: DEF contamination

The last time I filled my DEF tank was at a T/A Truckstop for $2.95 per gallon. Much easier and less messy than fooling with the 2.5 gal. containers and about half the cost.
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Old 11-20-2014, 09:50 PM
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Re: DEF contamination

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Originally Posted by Banjo View Post
The last time I filled my DEF tank was at a T/A Truckstop for $2.95 per gallon. Much easier and less messy than fooling with the 2.5 gal. containers and about half the cost.
Yep. Its 2.80 at the pump here. Just be darn sure it's not contaminated. Any grime or Diesel residue will poison your tank. A DEF distributor that sells storage tanks to trucking firms states on their website that a drop of diesel will contaminate a 500 gallon tank...yikes.

0.1 teaspoons of contaminant per 4800 gallon tanker of DEF is enough according to this site.

http://www.corefluids.com/def-contamination-levels/

Our tank is 8 gallons so that is 1/600th of a tanker. So the amount of contaminant allowed is only 1/600th of 0.1 teaspoons = 0.00082 milliliters = 0.000028 fluid oz...a tiny amount.
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Old 11-22-2014, 12:17 AM
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When I filled up my DEF tank at a truck stop, the DEF pump was kept inside a separate, sealed cylinder. It was somewhat reminiscent of one of those bank teller pneumatic tubes. The user had to open it up and pull the pump handle out. It was somewhat unwieldy because the hose retractor was quite firm. Anyway, the arrangement seemed quite clean to me, but I didn't scrutinize the nozzle.

I will refill there again, but I have decided my DEF strategy is to keep the tank below 50%, as I seem to be going through about 1 tank per year. Have to remember to refill more than 1 gallon at a time, too, thanks to the ultrasonic sensors.

Long term, my DEF strategy is "deletion" (haha)
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Old 11-22-2014, 12:52 AM
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Re: DEF contamination

Quote:
Originally Posted by Roadkill View Post
When I filled up my DEF tank at a truck stop, the DEF pump was kept inside a separate, sealed cylinder. It was somewhat reminiscent of one of those bank teller pneumatic tubes. The user had to open it up and pull the pump handle out. It was somewhat unwieldy because the hose retractor was quite firm. Anyway, the arrangement seemed quite clean to me, but I didn't scrutinize the nozzle.

I will refill there again, but I have decided my DEF strategy is to keep the tank below 50%, as I seem to be going through about 1 tank per year. Have to remember to refill more than 1 gallon at a time, too, thanks to the ultrasonic sensors.

Long term, my DEF strategy is "deletion" (haha)



Most of those sealed compartments are heated to - at least they are here in the upper Midwest.


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Old 11-24-2014, 05:53 PM
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Re: DEF contamination

Over the course of 14,360 miles i've purchased a total of 6 gallons of DEF fluid at a high-volume Kwik Trip truckstop. Just today I added 2 gallons @ $2.30/gallon. I add DEF when the tank hits the one quarter range, and I never fill it past three quarters. Never have I found the nozzle to be dirty, although I do clean the nozzle prior to inserting it into my tank. Just my $0.02.


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